燃煤电厂湿法脱硫筛板塔数值模拟研究

Study on the Numerical Simulation of Wet Desulfurization Sieve Plate Tower in Coal-Fired Power Plant

针对气-液逆流喷淋塔式湿法脱硫吸收塔,为改善塔内烟气流场、提高浆液喷淋量,采用FLUENT软件对筛板塔进行塔内烟气流场的数值模拟计算。结果表明,空塔中增设1层筛板可以有效改善塔内流场,提高烟气分布均匀性,从而提高脱硫效率;已有一层筛板时,可再新增一层筛板,双层筛板对塔内烟气流场均匀效果优于单层筛板,但其阻力要大于单层筛板。当筛板开孔率在33%和60%时,塔内烟气流场均匀性随筛板开孔率的增大而先升高再下降,即存在一个最佳开孔率;不同的筛板安装高度对塔内流场有影响,安装高度比57.7%的流场均匀性要优于50%,且筛板的存在可放大直段对烟气流场的优化效果。

FLUENT software was used to conduct numerical simulation calculation of the smoke flow field in the sieve plate tower in order to improve the smoke flow field in the tower and increase the amount of slurry spray aiming at the wet desulfurization absorption tower of gas-liquid counter-current spray tower.The results showed that adding a layer of sieve plate in the empty tower could effectively improve the flow field in the tower and improve the uniformity of smoke distribution,and thus improve the desulphurization efficiency.When there was one layer of sieve plate,another layer of sieve plate could be added.The uniform effect of double-layer sieve plate on smoke flow field in the tower was better than that of single-layer sieve plate,but its resistance was greater than that of single-layer sieve plate.When the perforation rate of the sieve plate was 33%and 60%,the uniformity of smoke flow field in the tower increased first and then decreased with the increase of the perforation rate of the sieve plate,that is,there was an optimal perforation rate.The installation height of different sieve plate had an impact on the flow field in the tower,and the uniformity flow field with the installation height to 57.7%was better than 50%,and the existence of sieve plate could amplify the optimization effect of the straight section on the smoke flow field.